Watch an exclusive sneak peek from BBC America's original series ORPHAN BLACK - then don't miss an all new episode *** Saturday April 6 at 9pm/8c *** only on BBC America. Immediately following the new episode of DOCTOR WHO, presented by SUPERNATURAL SATURDAY.

Here, with a body in her car and nowhere to turn, outsider Sarah (TATIANA MASLANY, The Vow, Picture Day) is forced to continue her con, assuming the identity of a dead woman who looks just like her. But instead of solving her problems, the street-smart chameleon is thrust headlong into a kaleidoscopic mystery. She makes the dizzying discovery that she and the dead woman are clones...but are they the only ones?

Now, with a killer on her tail, her only hope of finding answers lies with another apparent 'identical,' Alison.

"I just want some answers... Please just tell me who are we to each other?""Are you out of your mind?"